PHILIPPI2VB TERPENES AND ESSENTIAL OILS, III. 

 Table IV. — Second-grade ylang-ylang oils. 



129 



No. 



.- 



30f 



Specific 



gravity, 



30° 



4° 



Ester 

 number. 



Acetyl 

 number. 





Degrees. 









21 



1.4933 



—46.2 



0.915 



85 



132 



A 



1. 4928 



-40.4 



0.912 



86 



130 



M 



1.4923 



-38.5 



0.914 



86 



138 



L 



1.4913 



—42.2 



0.910 



86 



127 



26 



1.4923 



—39.8 



0.915 



88 



141 



39 



].5014 



-79.3 



0.910 



83 



112 



■ 40 



1.50U 



—70.9 



0.916 



84 



108 



41 



1.5004 



-70.4 



0.914 



83 



109 



42 



1.5010 



—74.0 



0.912 



74 



107 



43 



1. 5012 



-78.8 



0.909 



74 



104 



44 



1.5012 



-73.2 



0.912 



85 



109 



45 



1.4922 



-39.2 



0.912 



87 



120 



46 



1.4910 



-41.0 



0.905 



85 



124 



47 



1. 4915 



-41.0 



0.913 



85 



131 



36 



1.4990 



—71.2 



, 0. 905 



71 



96 



37 



1.6002 



-77.2 



0.906 



72 



101 



38 



1.5008 



—71.9 



0.912 



74 



103 



50 



1.4910 



-43.0 



0.910 



84 



131 



54 



1. 4920 



-41.8 



0.910 



84 



127 



5 



1.5030 



-58.7 



0.923 



80 



115 



6 



1.5005 



-49.0 



0.925 



87 



118 



8 



1. .5021 



-56.0 



0.925 



75 



110 



I have also undertaken the extraction of the perfume oil from ylang- 

 ylang flowers. Many of the constituents of essential oils are very delicate 

 substances and distillation with steam decomposes these compounds to 

 a considerable extent, so that a steam-distilled oil but rarely has exactly 

 the same odor as the flowers from which it was obtained. Extraction 

 with cold solvents and the removal of the solvent in vacuo, the tem- 

 perature never being allowed to rise above 40°, gives oils which have 

 exactly the same aroma as the flowers. This process has the further com- 

 mercial advantage that such extracted flower oils can not be imitated 

 synthetically, as the change in aroma is undoubtedly due to traces of 

 very easily decomposable compounds which it \^t.11 be difficult, if not 

 impossible, ever to isolate and identify. The extracted oil need fear no 

 competition with synthetic oils. Alcohol, ether, chloroform, and pe- 

 troleum ether have been used as solvents for ylang-ylang oil, and the last 

 named has given the best results. Naturally, a very high grade of 

 petroleum ether, which leaves no bad smelling residue when distilled up 

 to 40° in a vacuum of 40 millimeters, must be used as the solvent for 

 the essential oil. Operating in this manner, we have obtained oil yields 

 of from 0.7 to 1.0 per cent. The oil is of a very dark color and contains 

 a considerable amount of resin in solution. When in bulk, the odor is 

 not particularly pleasant or veiy strong, but when the extract is greatly 



